This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A181225 #9 Jun 07 2025 15:50:18 %S A181225 2,3,26,476,14905,708825,47514180,4264132468,493337571005, %T A181225 71476985762027,12673922434134249,2699365743596908540, %U A181225 679965250748621333815,199945129785484988046467,67870868805277105224767736,26339649115669349922436689846,11588494978121881119811952503395 %N A181225 Number of length 2n sequences p(i=0..2n-1) with 0<=p(i)<=i and having exactly n maxima. %H A181225 R. H. Hardin, <a href="/A181225/b181225.txt">Table of n, a(n) for n=1..135</a>. %F A181225 a(n) = A181229(2n,n). %Y A181225 Cf. A181229. %K A181225 nonn %O A181225 1,1 %A A181225 _R. H. Hardin_, Oct 10 2010